Journal article Open Access

Decoupled ecomorphological evolution and diversification in Neogene-Quaternary horses

Cantalapiedra, J. L.; Prado, J. L.; Hernández Fernández, M.; Alberdi, M. T.

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    <subfield code="a">Evolutionary theory has long posited a connection between trait evolution and diversification rates. Here, we use phylogenetic methods to evaluate the relationship of lineage-specific speciation rates and the mode of evolution of body size and tooth morphology in the Neogene and Quaternary radiation of horses (8 living and 130 extinct species). We show that diversification pulses are a recurrent feature of equid evolution, but that these are not correlated with rapid bursts in phenotypic evolution. Rather, rapid cladogenesis seems repeatedly associated with extrinsic factors that relaxed diversity bounds, such as increasing productivity and geographic dispersals into the Old World. This evidence suggests that diversity dynamics in Equinae were controlled mainly by ecological limits under diversity-dependence, rather than rapid ecomorphological differentiation.</subfield>
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    <subfield code="a">Prado, J. L.</subfield>
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    <subfield code="a">Hernández Fernández, M.</subfield>
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    <subfield code="a">10.1126/science.aag1772</subfield>
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    <subfield code="a">Decoupled ecomorphological evolution and diversification in Neogene-Quaternary horses</subfield>
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